68391908 has 12 divisors (see below), whose sum is σ = 128892540. Its totient is φ = 31565472.

The previous prime is 68391893. The next prime is 68391929. The reversal of 68391908 is 80919386.

It can be written as a sum of positive squares in 2 ways, for example, as 13897984 + 54493924 = 3728^2 + 7382^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 657563 + ... + 657666.

It is an arithmetic number, because the mean of its divisors is an integer number (10741045).

Almost surely, 2^68391908 is an apocalyptic number.

It is an amenable number.

68391908 is a deficient number, since it is larger than the sum of its proper divisors (60500632).

68391908 is a wasteful number, since it uses less digits than its factorization.

68391908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315246 (or 1315244 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 68391908 is about 8269.9400239663. The cubic root of 68391908 is about 408.9481425476.

The spelling of 68391908 in words is "sixty-eight million, three hundred ninety-one thousand, nine hundred eight".